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Preparation method of magnetic colloid core-shell structured gamma-Fe2O3 and Fe3O4

A core-shell structure and colloid technology, applied in the directions of ferrous oxide, iron oxide/iron hydroxide, iron oxide, etc., can solve the problem that the colloid has not been synthesized, and achieve the effect of simple and feasible method.

Inactive Publication Date: 2017-09-08
XINXIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a simple and controllable method for synthesizing colloids is still a great challenge. Although some achievements have been made in the synthesis of colloids, colloids with a core-shell structure have not been synthesized so far.

Method used

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  • Preparation method of magnetic colloid core-shell structured gamma-Fe2O3 and Fe3O4
  • Preparation method of magnetic colloid core-shell structured gamma-Fe2O3 and Fe3O4
  • Preparation method of magnetic colloid core-shell structured gamma-Fe2O3 and Fe3O4

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Experimental program
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Effect test

Embodiment 1

[0020] Magnetic colloidal core-shell structure α-Fe 2 o 3 preparation of

[0021] Weigh 0.8mmol ferric chloride (FeCl 3 ·6H 2 O, analytically pure, Sinopharm Chemical Reagent Co., Ltd.) and 0.3 g of structure-directing agent glycine (analytical pure, Sinopharm Chemical Reagent Co., Ltd.) were dissolved in a mixed solution of 2 mL deionized water and 18 mL ethanol, and continuously Stir for 5min, then transfer the mixture to a 50mL polytetrafluoroethylene liner reactor, heat and react at 160°C for 12h, after the reaction is completed and naturally cool to room temperature, collect the precipitate by centrifugation, wash with ethanol several times, and then dry at 60°C Obtained magnetic colloidal core-shell structure α-Fe 2 o 3 .

Embodiment 2

[0023] Magnetic colloidal core-shell structure γ-Fe 2 o 3 preparation of

[0024] Weigh a certain amount of α-Fe 2 o 3 Placed in a nitrogen atmosphere (nitrogen purity 99.999%), heated to 600°C at a heating rate of 20°C / min and kept for 5 hours, and cooled naturally to room temperature to obtain the product. The XRD spectrum of the resulting product is as figure 1 , XRD pattern analysis showed that the sample was mixed with γ-Fe 2 o 3 (JCPDS no. 04-0755) each diffraction peak is completely corresponding, and there are no other miscellaneous peaks, indicating that the product obtained after heat treatment is pure phase γ-Fe 2 o 3 . Product SEM photo as figure 2 As shown, it can be seen that controlling the reaction temperature and calcination time can obtain γ-Fe with good morphology. 2 o 3 Core-shell structure. The core-shell structure is still a colloidal structure formed by the assembly of small particles as basic units.

Embodiment 3

[0026] Magnetic colloidal core-shell Fe 3 o 4 preparation of

[0027] Weigh a certain amount of α-Fe 2 o 3 Place in a mixed atmosphere of hydrogen and argon (where the volume percentage of hydrogen is 5%), heat to 500°C at a heating rate of 30°C / min and keep it for 1h, and cool naturally to room temperature to obtain the product. The XRD pattern of obtained product is as image 3 As shown, with Fe 3 o 4 Compared with the standard spectrum (JCPDS no. 11-0664), all the diffraction peaks can correspond perfectly, and no other diffraction peaks exist, indicating that the obtained product is pure phase Fe 3 o 4 . The SEM photo of the resulting product is as Figure 4 Shown, enlarged SEM photographs ( Figure 4 b) It shows that the core-shell structure is still a colloidal structure formed by the assembly of small particles.

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Abstract

The invention discloses a preparation method of magnetic colloid core-shell structured gamma-Fe2O3 and Fe3O4 and belongs to the technical field of preparation of core-shell structured nano materials. The key points of the technical scheme adopted by the invention are as follows: firstly, glycine is taken as a structure-directing agent, and the magnetic colloid core-shell structured alpha-Fe2O3 is prepared as a precursor by using a water and ethanol mixed solvent thermal method; then the magnetic colloid core-shell structured gamma-Fe2O3 and Fe3O4 are respectively obtained through thermal treatment in different atmospheres. The preparation method disclosed by the invention is simple, convenient and feasible; the size of a synthesized magnetic colloid core-shell structured product is controlled by the magnetic colloid core-shell structured alpha-Fe2O3 as the precursor, so that a practical product of the magnetic colloid core-shell structured alpha-Fe2O3 is expanded.

Description

technical field [0001] The invention belongs to the technical field of synthesis of core-shell structure nanomaterials, in particular to a magnetic colloidal core-shell structure γ-Fe 2 o 3 and Fe 3 o 4 method of preparation. Background technique [0002] The three-dimensional superstructure composed of nanoparticles exhibits excellent physical and chemical properties. This complex superstructure that assembles basic structural units into functions has attracted great interest from researchers in the fields of chemistry, physics and materials science. The colloidal structure is one of the three-dimensional superstructures composed of microstructural units of different shapes. As an important type of colloidal structure in the superstructure, it is a microcapsule or microsphere with a hollow structure and a shell. The shell is generally It consists of densely packed colloidal particles or solidified colloidal particles. Since researchers first synthesized colloids using ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01G49/08B82Y40/00
CPCC01G49/06B82Y40/00C01G49/08C01P2002/72C01P2004/03C01P2004/32C01P2004/45
Inventor 郭志超程素君张丽伟申建芳
Owner XINXIANG UNIV
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